ES2643053T3 - Motorized Bogie for a low-ground rail vehicle - Google Patents

Abstract

Bogie (10) motorized for rail vehicles, comprising: - a chassis (15), consisting of: - two stringers (16) extending parallel to each other and parallel to a longitudinal direction, - two sleepers (17 ), carried by the stringers (16), which extend parallel to each other, and - parallel to a transverse direction perpendicular to the longitudinal direction, - two supports (18), each support (18) being carried by the two sleepers (17), - two axle structures (30), each comprising two axle boxes (32) each connected to one of the respective stringers (16) and a transverse shaft shaft (34), which extends in the transverse direction between two ends each bearing a respective wheel (14), the wheels (14) defining between them an interior space (I), delimited in the transverse direction between the wheels of the same axle shaft (34) and delimited in the longitudinal direction 15 between the two axle shafts (34), - at least one motor (20) carried by one of the sleepers (17) of the chassis, arranged in the interior space (I) delimited by the wheels (14) and consisting of a shaft of coupling (22), - at least one reducer (24) that guarantees the mechanical connection between the coupling shaft (22) of the motor (20) and one of the axle shafts (34), characterized in that: - the bogie ( 10) consists of primary suspension means (40), which consist of first suspension elements (42) arranged between the sleepers (17) and the stringers (16) of the chassis (15), - the reducer (24) is arranged outside said interior space (I), the coupling shaft (22) of the motor (20) extending from the motor (20) beyond one of the corresponding stringers (16) to the reducer (24).

Description

DESCRIPTION

Motorized Bogie for a low-ground rail vehicle

[0001] The present invention relates to a motorized bogie for a rail vehicle with lowered ground.

Document DE-C1-41 39 228 describes a motorized bogie according to the preamble of claim 1. A motorized bogie is especially intended to equip a railway vehicle whose box is arranged on two passenger transport floors. Usually, the two floors extend along a central part A of the box that is located between two bogies (as shown in Figure 6).

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[0002] Vehicle access doors, which allow passengers easy access to the vehicle from the platform or from the vehicle, are also located between the two bogies. Indeed, due to the height of a classic bogie, it is not possible to have an access door at the level of such a bogie, since the height of this door would then be incompatible with the height of the platform. Classically, the doors are arranged so

15 adjacent to the bogies of the railway vehicle.

[0003] Such arrangement of the doors is not entirely satisfactory. Indeed, the central part of the box, on which the two floors are arranged, is limited as! by the bogies and the doors. Usually, a single-story compartment is arranged at the level of the bogies, but such a compartment can only accommodate a small number

20 passengers

[0004] The invention is especially aimed at solving this problem, proposing a motorized bogie that allows to increase the number of passengers that can be transported in a rail vehicle.

[0005] For this purpose, the invention has as its object a motorized bogie for railway vehicles, which

understands:

- a chassis consisting of:

• two stringers that extend parallel to each other and parallel to a longitudinal direction 30,

• two sleepers, carried by the stringers, which extend parallel to each other, and parallel to a transverse direction perpendicular to the longitudinal direction,

• two supports, each support being carried by the two sleepers,

35 - two axle structures, each comprising two axle boxes each connected to one of the respective stringers and a transverse axle shaft, which extends in the transverse direction between two ends each bearing a respective wheel, defining the wheels between them an interior space, delimited in the transverse direction between the wheels of the same axle shaft and delimited in the longitudinal direction between the two axle trees,

40 - at least one motor carried by one of the sleepers of the chassis, arranged in the interior space delimited by the wheels and consisting of a coupling shaft,

- at least one reducer that guarantees the mechanical connection between the motor coupling shaft and one of the axle shafts,

45 characterized in that:

- the bogie consists of primary suspension means, which consist of first suspension elements arranged between the sleepers and the chassis stringers,

- the reducer is arranged outside said interior space, the coupling shaft of the motor 50 extending from the motor beyond one of the corresponding stringers to the reducer.

[0006] In a bogie of the state of the art, the primary suspension means are arranged outside the interior space and the reducer is arranged in this interior space. Such a reducer is particularly bulky, especially in height, so that it is the height of this reducer that imposes the low limit of the

55 distance between a wheel support plane and a railway vehicle box carried by the bogie.

[0007] According to the invention, the structure of the primary suspension means, whose first suspension elements are arranged in the interior space, allows the space outside this interior space to be released.

[0008] It is then possible to arrange the reducer on the outside of the interior space, so that this reducer

the level of the railway vehicle box is no longer available. Thus, in the invention, the reducer does not influence the minimum distance between the wheel support plane and the rail vehicle box.

[0009] In a bogie according to the invention, this minimum distance is imposed by the upper part of the boxes.

shaft, which have a lower height than the reducer. Thus, in the invention, the minimum distance between the wheel support plane and the railway vehicle box is less than that imposed by the structure of a state-of-the-art bogie.

10 [0010] The box being reduced, it is possible to arrange a door of this box at the level of the bogie, being able to be

arranged this door at the level of the platform. This allows to increase the length of the central part of the box where the two floors are arranged. With the length of the two floors being increased, the passenger accommodation capacity in the box is thus increased.

[0011] The motorized bogie according to the invention may comprise one or more of the features.

following, taken in isolation or according to any technically possible combination:

- each axle structure is connected to one of the respective stringers by an axis joint parallel to the transverse direction, and

20 - the primary suspension means consist, for each axle structure, of at least a second suspension element disposed between the axle structure and the crossbar;

- secondary suspension means, carried by each support of the chassis and consisting of support means with a railway vehicle box, the secondary suspension means being arranged transversely at least partially outside the interior space;

25 - each first suspension element has a ring shape and is made of an elastic material, this first suspension element being intercalated radially between one of the chassis sleepers and the edges of a hole provided in one of the stringers;

- each first suspension element is made of rubber;

- each first suspension element has a defined annular shape between an inner diameter and an outer diameter 30, the difference between this inner diameter and this outer diameter being almost equal to 100 mm;

- every second suspension element is formed by a connecting rod.

[0012] The invention also relates to a railway vehicle comprising a box, characterized in that it consists of a bogie as defined above.

35

[0013] Advantageously, the railway vehicle consists of one or more of the following characteristics, taken in isolation or according to any technically possible combination:

- the box consists of at least one access door arranged at the level of the bogie;

40 - the distance, in a vertical direction perpendicular to the longitudinal and transverse directions, between the access door and a wheel support plane is less than or equal to 850 mm.

[0014] The invention will be better understood by reading the description that follows, given only by way of example and made in reference to the attached drawings, in which:

Four. Five

- Figure 1 is a perspective view of a frame of a railway vehicle bogie according to an example of an embodiment of the invention; Y

- Figure 2 is a perspective view of a railway vehicle bogie, consisting of the frame of Figure 1; Y

- figure 3 is a top view of the bogie of figure 2; Y

50 - Figure 4 is a side view of a bogie of the state of the art; Y

- figure 5 is a side view of the bogie of figure 2; Y

- Figure 6 is a schematic side view of a railway vehicle of the state of the art; Y

- Figure 7 is a schematic side view of a railway vehicle whose box is equipped with similar bogies

to that of figure 2.

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[0015] In the present description, the terms "vertical" and "horizontal" are defined according to their usual meanings, with respect to a bogie mounted on a railway vehicle. Thus, a horizontal plane is almost parallel to a plane in which bogie axes extend and a vertical plane is almost parallel to a plane in which bogie wheels extend.

[0016] The term "longitudinal" is defined according to its usual meaning, as applied to the direction in which it

it extends a railway vehicle in a horizontal plane and the term "transverse" is defined according to its usual sense, as applied to a direction almost perpendicular to the longitudinal direction in a horizontal plane.

[0017] A reference point has been represented in the figures, in which a longitudinal direction is

designated by reference X, a transverse direction is designated by reference Y, and a vertical direction, perpendicular to longitudinal directions X and transverse Y, is designated by reference Z.

[0018] On the other hand, the terms "anterior" and "posterior" are defined according to their usual meanings with

10 with respect to the direction of travel of the railway vehicle in the longitudinal direction X. By agreement, in the figures, the term "anterior" corresponds to the left and the term "posterior" to the right. It should be noted that a railway vehicle can usually circulate in two opposite directions, then the terms "anterior" and "posterior" are reversed in an equivalent manner when the direction of circulation is reversed.

[0019] A railway vehicle bogie 10 has been shown in Figure 2, for example for a train of

Regional express transport (TER) of low ground. On the other hand, a frame of this bogie 10 is shown on the other hand.

[0020] The bogie 10 comprises two pairs 12 of wheels 14, arranged respectively at the front and 20 at the rear of the bogie 10. The wheels 14 of each pair 12 are carried and connected to each other by a

shaft structure 30 corresponding to this pair 12.

[0021] Each axle structure 30 consists of two axle boxes 32, namely one for each wheel 14, as! like a shaft shaft 34 that extends in the transverse direction Y between two ends, of which each carries a

25 wheel 14 respectively.

[0022] In the present description, an interior space I is defined, delimited in the transverse direction between the wheels 14 and in the longitudinal direction, between the axle shafts 34.

[0023] Shaft structures 30 carry a chassis 15 by means of joints 36 and means of

primary suspension 40, which will be described later.

[0024] The chassis 15 consists of two lateral stringers 16, of rocker type, each extending parallel to the longitudinal direction X, two sleepers 17, each extending parallel to the

35 transverse direction Y, therefore transversely to the lateral stringers 16 and two supports 18, console type, intended to receive the box 60 of the railway vehicle.

[0025] Each spar 16 is connected, at one of its ends, to a respective axle housing 32, by means of a respective articulation 36.

40

[0026] Each joint 36 consists, for example, of a shaft rod parallel to the transverse direction Y,

carried at the end of the corresponding stringer 16, which cooperates with a complementary pivot element

carried by the axle housing 32. This pivot element is carried below an upper part of the axle housing 32, in the vertical direction Z, so that the beam 16 extends below this upper part of the housing shaft

45 32.

[0027] More particularly, this upper part of the axle housing 32 imposes a minimum limit at a height at which a box 60 of the railway vehicle can be arranged, carried by the bogie 10. In other terms, the minimum value of a distance D, shown in figure 5, between a support plane of the wheels 14 and the means

50 support 52 to the box 60 of railway vehicle is imposed by the height of this upper part of axle box 32.

[0028] It will be noted that, in the state of the art, as shown in Figure 4, the minimum value of

a distance D 'between a support plane of the wheels 14' and the support means 52 'to a box 60' of railway vehicle is imposed by the height of an upper part of a reducer. Thus, this distance D 'in a bogie 10' from

The state of the art is greater than the distance D of the bogie of the invention.

[0029] The primary suspension means 40 consist of first suspension elements 41, arranged between the sleepers 17 and the stringers 16, which guarantee the connection between these sleepers 17 and these stringers 16.

[0030] More particularly, first transverse openings 19 are provided in the stringers 16 to receive the sleepers 17. Advantageously, the first transverse openings 19 have a cross-section generally identical to that of the cross-section of the sleepers 17, by example a circular section. Each cross member 17 passes through one of the first respective transversal openings 19 of each

5 stringer so that each cross member 17 extends laterally beyond the stringers 16. The two cross ties 17 carry together, at each of their ends, one of the respective supports 18 intended to receive the box 60 of the rail vehicle.

[0031] In the described example, each cross member 17 has a diameter smaller than a diameter of the openings 10 19, so that a free annular space is defined between the cross ties 17 and the stringers 16.

[0032] As indicated above, the first suspension elements 42 are advantageously arranged in the free annular spaces between the stringers 16 and the sleepers 17.

[0033] As can be seen in Figure 1, which represents a preferred embodiment, the first

suspension elements 42 each have a general annular shape and each form an elastic connection between one of the stringers 16 and one of the respective sleepers 17.

[0034] The annular suspension element 42 has an outer diameter defined in an X-Z plane that 20 consists of the longitudinal X and vertical directions Z and an inner diameter defined in the X-Z plane.

[0035] A difference between this outer diameter and this inner diameter is preferably 100 mm, which corresponds almost to the difference between the diameter of the cross member 17 and the diameter of the corresponding opening 19. On the other hand, the suspension element 42 consists of a dimension in the transverse direction Y

25 between 100 to 150 mm. These first suspension elements 42 are made of an elastic material, for example of rubber.

[0036] It will be noted that the first suspension elements 42 are less eccentric than classical primary suspension means. More particularly, considering a center of Bogie C, represented in the

Figure 3, defined as a point longitudinally at medium distance between axles 30 and transversely at medium distance between wheel planes 14, the distance between the first suspension elements 42 and center C is shorter than the distance between classical primary suspension means and a center C of the state of the art. Thus, when the bogie goes through some defects of vlas (also called "left"), the vertical displacement of the first suspension elements 42 is less than the vertical displacement of classical primary suspension means 35. Since the vertical displacement experienced by the first suspension elements 42 is reduced, the dimensions of these first suspension elements 42 in the vertical direction Z are reduced with respect to those of classical primary suspension means.

[0037] The primary suspension means 40 on the other hand consist of a few second suspension elements 44, arranged between the stringers 16 and the axle boxes 32. More particularly, as can be seen

especially in FIG. 1, each second suspension element 44 is disposed between one end of one of the respective stringers 16 and one of the axle boxes 32, this second suspension element 44 being adapted to dampen a relative rotational movement of the stringer 16 and of the corresponding axle housing 32 around the articulation 36.

Four. Five

[0038] Each second suspension element 44 consists, for example, of an arm extending almost in the longitudinal direction X from the end of the corresponding stringer 16, to the corresponding axle housing 32, to which it is connected by a pivot connection. Each second suspension element 44 is arranged, for example, relatively to the vertical direction Z, below the joint 36 carried by the same end of the crossbar 16.

fifty

[0039] Each second suspension element 44 is formed, for example, by a connecting rod.

[0040] Figure 3 shows two motors 20 which are each carried respectively by one of the sleepers 17. These motors are arranged in the interior space I delimited by the wheels 14. Each motor is of the

55 "fast" type, that is, it works at a high rotational speed (number of turns per minute) and, consequently, has a reduced volume.

[0041] Classically, each motor 20 is connected to at least one of the pairs 12 of wheels 14 by means of a coupling shaft 22 and a reducer 24. The coupling shaft 22 of the motor 20 passes through a

60 crossbar 16 for an opening 21.

[0042] Thus, the coupling shaft 22 extends from inside the interior space I to the outside of this interior space I. For example, the coupling shaft 22 consists of engagement means with gear.

5

[0043] Advantageously, the reducer 24 is connected to the support 18 of the chassis 15 by means of a reaction rod 25, which stabilizes this reducer 24 vertically at the level of the motor coupling shaft 22.

[0044] The bogie 10 consists on the other hand of secondary suspension means 50, carried by the support 18 of the chassis 15, at least partially outside the interior space I. More particularly, the means of

Secondary suspensions 50 are disposed outside of an inner zone delimited in the transverse direction Y between the stringers 16.

[0045] Advantageously, the highest point of the secondary suspension means 50 is located 15 below the top of the wheels 14 in the vertical direction Z, as shown in Figure 5. The height of

this highest point of the secondary suspension means 50, taken from a support plane of the wheels 14 is for example almost equal to 700 mm.

[0046] The secondary suspension means 50 are equipped with support means 52 to the box 60 of 20 railway vehicles, which allow to receive all the vertical forces exerted by the box 60 in the bogie 10.

[0047] As can be seen by comparing Figure 4, which represents a classic bogie 10 'of the state of the art, with Figure 5, which represents a bogie 10 according to the invention, the structure of the bogie 10 according to the invention authorizes the provision of the secondary suspension means 50 at a lower height than the prior art.

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[0048] Due to this reduced height, it is possible to arrange an access door 62 of the box at the level of the bogie 10.

[0049] The box 60 of the railway vehicle thus comprises at least one access door 62 arranged at level 30 of the bogie 10 (as shown in Figure 7). The maximum height of a floor at the foot of the door is 850 mm,

measured from the plane of support of the wheels 14 (therefore of the rails). Thus, the height of the door 62 is compatible with the height of a classic platform, which guarantees passengers to easily get on and off the rail vehicle.

[0050] As can be seen by comparing Figure 6, which represents a railway vehicle of the state of

the technique and figure 7, which represents a railway vehicle according to the invention, the longitudinal displacement of the doors 62 at the level of the bogies 10 (figure 7) allows to arrange a central part B on two floors in a greater length than the central part A of the classic vehicle (figure 6). The railway vehicle of the invention therefore consists of two longer levels, and therefore has a greater passenger transport capacity.

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[0051] It will be noted that the invention is not limited to the embodiment described above, but could present several variants without departing from the scope of the claims.

[0052] In particular, the invention could be applied to a carrier bogie, which does not consist of an engine.

Four. Five

[0053] On the other hand, the joints 36 between the stringers 16 and the axle boxes 32 could have a different structure than the one described above.

[0054] Finally, the bogie 10 according to the invention could be equipped with any other railway vehicle other than 50 a regional express transport train, for example a tram, subway or a large line train.

Claims (9)

1. Motorized Bogie (10) for rail vehicles, comprising: 5 - a chassis (15), consisting of: • two iargueros (16) that extend paralysis with respect to each other and paralysis to an iongitudinal direction, • two sleepers (17), lifted by the iargueros (16), which extend parallel to each other with respect to each other, and • paralysis to a transverse direction perpendicular to the iongitudinai direction, 10 • two supports (18), each support being lifted (18) by the two sleepers (17), - two axle structures (30), each comprising two axle boxes (32) each connected to one of the respective iargueros (16) and a transverse axle arboi (34), which extends in the transverse direction between two ends that each have a respective wheel (14), defining the wheels (14) between them an interior space 15 (I), delimited in the transverse direction between the wheels of the same axle shaft (34) and delimited in the iongitudinal direction between the two axle arboies (34), - at least one engine (20) lifted by one of the sleepers (17) of the chassis, arranged in the interior space (I) delimited by the wheels (14) and consisting of a collection arboi (22), - at least one reducer (24) that guarantees the mechanical connection between the motor arboi (22) of the motor (20) and 20 one of the axes of transverse axes (34), characterized in that: - the bogie (10) consists of primary suspension means (40), consisting of first suspension elements (42) arranged between the sleepers (17) and the iargueros (16) of the chassis (15), - the reducer (24) is disposed outside of said interior space (I), the coupling tree (22) extending from the motor (20) from the motor (20) beyond one of the corresponding iargueros (16) to the reducer (24). 25 2. Motorized Bogie (10) according to claim 1, in which: - each axle structure (30) is connected to one of the respective iargueros (16) by a shaft joint (36) parallel to the transverse direction, and 30 - The primary suspension means (40) consist, for each axle structure (30), of at least a second suspension element (44) disposed between the axle structure (30) and the iarguero (16). 3. Motorized Bogie (10) according to any one of claims 1 or 2, consisting of secondary suspension means (50), lifted by each support (18) of the chassis and consisting of support means (52) 35 with a railway vehicle box (60), the secondary suspension means (50) being arranged transversely at least partially outside the interior space (I). 4. Motorized bogie (10) according to any one of claims 1 to 3, in which each first suspension element (42) has a form of aniiium and is made of an elastic material, this first being 40 suspension element (42) intercalated radiantly between one of the sleepers (17) of the chassis (15) and the edges of a hole provided in one of the iargueros (16). 5. Motorized bogie (10) according to claim 4, in that each first suspension element (42) is made of rubber. Four. Five 6. Motorized bogie (10) according to claim 4 or 5, in which each first suspension element (42) has a defined annular shape between an inner diameter and an outer diameter, the difference between this inner diameter and this outer diameter almost equal to 100 mm. 50. Bogie (10) motorized according to any of claims 1 to 3, in that every second suspension element (44) is formed by a bieia. 8. Railway vehicle, consisting of a box (60), characterized in that it consists of a bogie (10) according to any of the preceding claims. 55 9. Rail vehicle according to claim 8, in which the box (60) comprises at least one access door (62) arranged at the level of the bogie (10). 10. Rail vehicle according to claim 8 or 9, in which distance, in a vertical direction (Z) 60 perpendicular to the directions iongitudinai (X) and transverse (Y), between the access door (62) and a piano support 7 of the wheels (14) is less than or equal to 850 mm.